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Hot Forged R30035 Cobalt vs. Hot Worked R31538 Cobalt

Both hot forged R30035 cobalt and hot worked R31538 cobalt are cobalt alloys. Both are furnished in the hot worked condition. They have 61% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is hot forged R30035 cobalt and the bottom bar is hot worked R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 230
220
Fatigue Strength, MPa 500
410
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 89
86
Tensile Strength: Ultimate (UTS), MPa 1200
1120
Tensile Strength: Yield (Proof), MPa 980
800

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1320
1290
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 11
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.7
8.4
Embodied Carbon, kg CO2/kg material 10
8.1
Embodied Energy, MJ/kg 140
110
Embodied Water, L/kg 410
530

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 2090
1430
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 39
37
Strength to Weight: Bending, points 29
28
Thermal Diffusivity, mm2/s 3.0
3.5
Thermal Shock Resistance, points 29
27

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0 to 0.025
0.15 to 0.35
Chromium (Cr), % 19 to 21
26 to 30
Cobalt (Co), % 29.1 to 39
58.7 to 68.9
Iron (Fe), % 0 to 1.0
0 to 0.75
Manganese (Mn), % 0 to 0.15
0 to 1.0
Molybdenum (Mo), % 9.0 to 10.5
5.0 to 7.0
Nickel (Ni), % 33 to 37
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.015
0
Silicon (Si), % 0 to 0.15
0 to 1.0
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0 to 1.0
0